Faded Memories

After Lucifer rises, Dean is thrown back into hell where he takes up the mantle of his old master and becomes a white-eyed demon. He begins to forget what his life was like as a human and completely assimilates into a demons mindset and life. So on one completely normal day in hell when he's given the special present of an angel on his rack, shouldn't it just be another creature to torture?

Rated for descriptions, might not actually be Mature.